Annoyingly cant be done from UK, like others said you need the schengen visa which you have to get in Thailand. Ive not looked into it deeply but my first impression is to get the schengen you need to have your europe trip booked. which is annoying, It would be good to be able to book a last minute flight and nip over to spain for a long weekend. Turkey is doable but a 4 hour flight, great place though.
You have to use mobile data not WiFi to register your new phone on the app. So I think you would need to use your thai SIM card and data associated with the phone number that bank has for your account.
As usual on arsebook a load of nonsense and uniformed replys. A friend of mine returned to Uk recently after living here years. Sadly riddled with cancer and was treated immediately and treated well. NHS not perfect but not as bad as the MSM and clowns on this site would have you believe. Good luck.
Does the agent mean you need more money in your account in the UK? If so he’s probably right and not a scam like all the experts on here are telling you. To get the visa you need to show you can support her in the UK, so money needs to be in your account not her’s.
If you have no visa it is very risky to fly on a one way ticket they will probably refuse you. There are websites that let you book tickets and then get a refund (less a small charge) for this very reason. Sorry I can’t remember the names, they basically rent you a ticket to get round your problem. Do a Google search. Otherwise yes book a ticket out of Thailand. On the few occasions I have travelled on a one way they have always asked for a booking out of Thailand.